[XLA] Simplify the SplitF64ToF32 algorithm
[XLA] Simplify the SplitF64ToF32 algorithm

Compute hi by rounding the input double to float. This should be identical numerically but with fewer operations.

PiperOrigin-RevId: 281836757
Change-Id: I982288ead9b4d8986db3ea0a17c29ce92e8dbd96

jhseu/tensorflow,tensorflow/tensorflow-pywrap_saved_model,tensorflow/tensorflow-pywrap_tf_optimizer,Intel-Corporation/tensorflow,tensorflow/tensorflow-pywrap_saved_model,davidzchen/tensorflow,tensorflow/tensorflow-pywrap_saved_model,jhseu/tensorflow,davidzchen/tensorflow,sarvex/tensorflow,frreiss/tensorflow-fred,frreiss/tensorflow-fred,petewarden/tensorflow,xzturn/tensorflow,paolodedios/tensorflow,freedomtan/tensorflow,yongtang/tensorflow,aam-at/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,yongtang/tensorflow,Intel-Corporation/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,ppwwyyxx/tensorflow,yongtang/tensorflow,cxxgtxy/tensorflow,frreiss/tensorflow-fred,xzturn/tensorflow,paolodedios/tensorflow,ppwwyyxx/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,xzturn/tensorflow,sarvex/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,paolodedios/tensorflow,petewarden/tensorflow,karllessard/tensorflow,tensorflow/tensorflow,annarev/tensorflow,renyi533/tensorflow,ppwwyyxx/tensorflow,tensorflow/tensorflow-pywrap_saved_model,ppwwyyxx/tensorflow,aam-at/tensorflow,frreiss/tensorflow-fred,aldian/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,davidzchen/tensorflow,cxxgtxy/tensorflow,ppwwyyxx/tensorflow,arborh/tensorflow,aam-at/tensorflow,sarvex/tensorflow,sarvex/tensorflow,arborh/tensorflow,petewarden/tensorflow,jhseu/tensorflow,Intel-tensorflow/tensorflow,xzturn/tensorflow,freedomtan/tensorflow,gautam1858/tensorflow,cxxgtxy/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,yongtang/tensorflow,cxxgtxy/tensorflow,ppwwyyxx/tensorflow,adit-chandra/tensorflow,annarev/tensorflow,renyi533/tensorflow,annarev/tensorflow,sarvex/tensorflow,jhseu/tensorflow,karllessard/tensorflow,tensorflow/tensorflow,renyi533/tensorflow,adit-chandra/tensorflow,arborh/tensorflow,gautam1858/tensorflow,ppwwyyxx/tensorflow,arborh/tensorflow,arborh/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,gunan/tensorflow,aam-at/tensorflow,Intel-Corporation/tensorflow,annarev/tensorflow,renyi533/tensorflow,renyi533/tensorflow,adit-chandra/tensorflow,Intel-tensorflow/tensorflow,paolodedios/tensorflow,tensorflow/tensorflow-pywrap_saved_model,freedomtan/tensorflow,karllessard/tensorflow,jhseu/tensorflow,adit-chandra/tensorflow,petewarden/tensorflow,frreiss/tensorflow-fred,tensorflow/tensorflow-pywrap_tf_optimizer,aldian/tensorflow,paolodedios/tensorflow,renyi533/tensorflow,frreiss/tensorflow-fred,xzturn/tensorflow,karllessard/tensorflow,petewarden/tensorflow,davidzchen/tensorflow,annarev/tensorflow,karllessard/tensorflow,Intel-tensorflow/tensorflow,xzturn/tensorflow,frreiss/tensorflow-fred,aldian/tensorflow,jhseu/tensorflow,tensorflow/tensorflow,cxxgtxy/tensorflow,paolodedios/tensorflow,jhseu/tensorflow,petewarden/tensorflow,jhseu/tensorflow,freedomtan/tensorflow,ppwwyyxx/tensorflow,renyi533/tensorflow,xzturn/tensorflow,gunan/tensorflow,davidzchen/tensorflow,Intel-Corporation/tensorflow,Intel-tensorflow/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,annarev/tensorflow,sarvex/tensorflow,Intel-tensorflow/tensorflow,gautam1858/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,paolodedios/tensorflow,adit-chandra/tensorflow,arborh/tensorflow,petewarden/tensorflow,tensorflow/tensorflow-pywrap_saved_model,paolodedios/tensorflow,aam-at/tensorflow,tensorflow/tensorflow-pywrap_saved_model,xzturn/tensorflow,annarev/tensorflow,jhseu/tensorflow,arborh/tensorflow,tensorflow/tensorflow,davidzchen/tensorflow,cxxgtxy/tensorflow,arborh/tensorflow,Intel-Corporation/tensorflow,yongtang/tensorflow,cxxgtxy/tensorflow,davidzchen/tensorflow,frreiss/tensorflow-fred,tensorflow/tensorflow,cxxgtxy/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,tensorflow/tensorflow,annarev/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,tensorflow/tensorflow,gunan/tensorflow,Intel-Corporation/tensorflow,renyi533/tensorflow,petewarden/tensorflow,aldian/tensorflow,karllessard/tensorflow,annarev/tensorflow,gunan/tensorflow,Intel-Corporation/tensorflow,davidzchen/tensorflow,adit-chandra/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,gautam1858/tensorflow,yongtang/tensorflow,aldian/tensorflow,gautam1858/tensorflow,freedomtan/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,adit-chandra/tensorflow,freedomtan/tensorflow,Intel-tensorflow/tensorflow,gautam1858/tensorflow,paolodedios/tensorflow,xzturn/tensorflow,Intel-tensorflow/tensorflow,gunan/tensorflow,gunan/tensorflow,frreiss/tensorflow-fred,karllessard/tensorflow,yongtang/tensorflow,petewarden/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,petewarden/tensorflow,frreiss/tensorflow-fred,Intel-Corporation/tensorflow,sarvex/tensorflow,arborh/tensorflow,ppwwyyxx/tensorflow,aam-at/tensorflow,Intel-tensorflow/tensorflow,aam-at/tensorflow,Intel-tensorflow/tensorflow,annarev/tensorflow,frreiss/tensorflow-fred,adit-chandra/tensorflow,jhseu/tensorflow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